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I keep getting this error, whenever I try to run my app on my iphone, which is running iOS 8.1.-
The Developer Disk Image could not be mounted.
User’s iPhone may be running a version of iOS that is not supported by this version of Xcode.
I tried restarting my mac and xcode, but problem persists.
Opening project in Xcode 6.1 then again in 6.0.1 seemed to fix issue, if your project is not ready to be compiled in 6.1!
Just ran into this after absentmindedly upgrading my phone to iOS 8.3. Resolution required an upgrade to OS X Yosemite (10.10) before I could update to a version of Xcode that supports that version of iOS.
Xcode 6.4 beta would not run iOS 8.3. Switched to Xcode 6.3 fixed the issue. And then when opening it back in 6.4 beta, was working fine.
Download the latest version of Xcode from the App Store. I had an early version of XCode 6.1 that lacked the 8.1 SDK. Upgrading to the latest fixed the problem.
Did you check your apps' base version. If the base version is set to 8 and your device is 7, you will probably get this error.
and if your base version, from what i imagine is 8.1 and your device is not updated to 8.1 it wont work either.
Xcode 6 only contains the iOS 8.0 SDK.
If you're running iOS 8.1 on your phone, then you'll need to upgrade to Xcode 6.1, which contains the iOS 8.1 SDK.